Power Supply Design Considerations
Power supply design is perhaps the most challenging aspect of the entire process of controlling noise and radiation in high-speed DSP design. This is largely because of the complexity of the dynamic load switching conditions. These include the DSP going into or out of low power modes, excessive in-rush current due to bus contention and charging decoupling capacitors, large voltage droop due to inadequate decoupling and layout, oscillations that overload the linear regulator output, and high current switching noise generated by switching voltage regulators. A clean and stable power supply design is required for all DSP systems to guarantee system stability. This chapter outlines the importance of proper power supply design and the methods to minimize unwanted noise.
KeywordsPower Supply Pulse Width Modulator Voltage Droop Buck Converter Error Amplifier
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- 1.Texas Instruments Inc (2008) LM317 3-Terminal Adjustable Regulator. http://focus.ti.com/lit/ds/symlink/lm317.pdf
- 2.Texas Instruments Inc (2008) Spice-Based Analog Simulation Program. http://focus.ti.com/docs/toolsw/folders/print/tina-ti.html.
- 3.Pressman Abraham (1991) Switching Power Supply Design. McGraw-Hill, New York.Google Scholar
- 4.Texas Instruments Inc (2008) TPS40195 4.5-V to 20-V Synchronous Buck Controller with Synchronization and Power Good. http://focus.ti.com/lit/ds/symlink/tps40195.pdf.
- 5.Texas Instruments Inc (2009) SM320C6713-EP Floating Point Digital Signal Processors. http://focus.ti.com/lit/ds/symlink/sm320c6713b-ep.pdf.
- 6.Texas Instruments Inc (2008) Power Management Guide. http://focus.ti.com/lit/sg/slvt145h/slvt145h.pdf.